Scroll Compressors

Air Squared is the industry leader in oil-free scroll compressor design and manufacturing. By introducing a simple and elegant design with fewer moving parts, scroll compressor technology offers OEM applications an oil-free, ultra-quiet and smooth-operating alternative to traditional reciprocating, diaphragm, and vain technology.

Air Squared, Inc. was founded in 1991 to service the needs of OEMs with oil-free scroll solutions for demanding positive displacement applications. Twenty years later, Air Squared is the industry leader in oil-free scroll design and manufacturing, with more experience and more scroll compressor models than any other company.

Range Capability Overview

Flow Rates 100 - 3,000 lpmv

Pressures 5 - 15 barg

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Sales Inquiries

Qualified OEMs should consult Air Squared for custom configurations and application specific requirements.

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Scroll Compressor Solutions from Air Squared

Find your oil-free solution through a growing line of liquid-cooled scroll compressors engineered specifically for OEMs and view past projects that supported liquid-cooled scroll technology development

While liquid cooling for oil-free and lubricated scroll compressor has been investigated in the past, patented liquid-cooled scroll technology from Air Squared offers the first oil-free scroll compressor design that provides effective cooling to both the fixed scroll and orbiting scroll. The patented technology allows coolant to be transferred between the fixed scroll and orbiting scroll without the use of dynamic seals.

Air-cooled scroll compressor designs are pressure-limited because the heat generated during compression causes the primary working components to thermally expand. The thermal expansion causes interference between the fixed scroll and orbiting scroll, eventually leading to mechanical failure. While the running clearance between the fixed scroll and orbiting scroll can be increased to avoid interference, this approach also decreases volumetric efficiency and pressure capability.

Liquid cooling allows for significantly more control over operating temperatures throughout the compression process. By removing heat generated during the compression process more effectively, thermal expansion is mitigated, allowing for high-pressure operation without sacrificing efficiency or reliability.

Sealed and Semi-hermetic configurations

Compared to air-cooled compressor designs, liquid cooling offers isolation of working fluid to ambient and drive componentry (i.e. motor). Air-cooled compressors cool the fixed scroll and orbiting scroll with ambient air. While this approach is adequate with an open-housing design, air colling is far less effective if the compression process is fully enclosed (e.g. sealed or semi-hermetic). Liquid-cooling solves this issue by providing effective cooling to the fixed scroll and orbiting scroll, even if the compressor is semi-hermetically sealed.

Liquid colling also operates independently of ambient conditions. This allows for effective cooling, even if the compressor is exposed to elevated ambient temperatures – as in under-the-hood vehicle applications.

For operation with flammable gases, such as O2 and H2, the “independent drive” series of liquid-cooled scroll compressors are easily configured with a magnetic coupling that fully isolates the working fluid from the motor.

Scroll Compressor Related Articles

Scroll Compressor FAQs

Monitoring speed is an important aspect of operating a scroll compressor or vacuum pump, as operation over the specified maximum speed can result in premature or catastrophic failure.

For scroll compressors and vacuum pumps that have a brushless DC motor, speed can be measured by connecting a digital tachometer between a hall sensor and ground. The tachometer must be programmed to the correct number of pulses per revolution, which can be determined by dividing the numbers of motor poles by 2. For example, an 8-pole motor will have 4 pulses per revolution.

Alternatively, an oscilloscope can also be used to measure the frequency of the hall sensors. Divide the measured frequency by the number of pulses per revolution and multiply by 60 to determine the RPM.

For scroll compressors and vacuum pumps that have an AC motor, speed can be measured by multiplying the frequency of the variable frequency drive (VFD) by 60 to determine the RPM.

Air Squared does not provide operation manuals for most products.

Given the specialized nature of our scroll products, Air Squared works directly with OEM customers to install, operate, test, evaluate, and service products. Customers who require an operation manual should contact their Sales Representative.

If you do not have a Sales Representative, start with our Application Assistant or contact Sales directly.

Application Assistant

Looking at the face of the unit, the motor shaft for scroll compressors and scroll vacuum pumps rotates clockwise.

Most Air Squared products do not have a CE conformity marking.

Our products are primarily designed for OEMs and not intended for end users. As most OEM systems already require CE marking, conformity specific to an Air Squared product is generally not required.

OEM customers that require conformity specific to an Air Squared product should contact their Sales Representative.

Most scroll compressors have a discharge port centered on the face of the unit, with the inlet port positioned near the periphery.

Scroll Compressor News

Air Squared Part of Cross-Industry Collaboration Developing Hybrid Power Generation System

November 09, 2018

The ARPA-E INTEGRATE program has awarded a four-organization team, including Air Squared, funding to develop an innovative 125 kWe distributive power system.

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Cost Barriers Shattered with Low-Cost Pump Development

September 01, 2017

ARPA-E funds scroll development to optimize cost, opening dozens of markets previously too cost-sensitive to consider scroll technology.

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NASA Funds Multi-Stage Scroll Compressor Technology

May 05, 2017

Air Squared awarded SBIR Phase I funding to develop two scroll solutions that will support ISRU processes by collecting, separating, pressurizing, or processing gasses from the Mars atmosphere.

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Air Squared Awarded Contract to Develop Scroll Compressor in NASA MOXIE Demonstration Unit for Mars 2020 Mission

February 02, 2016

Air Squared has been awarded a contract from the Jet Propulsion Laboratory to design and develop a CO2 scroll compressor that will be used in the MOXIE technology demonstration experiment for the Mars 2020 mission.

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NASA Outreach Program Assists Air Squared

March 26, 2012

New compressor design heads to production thanks to assistance from NASA outreach program.

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Plug Power Places Large Production Order

October 27, 2011

Plug Power places large production order for Air Squared compressors used in GenDrive fuel cell units.

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Air Squared in Machine Design

September 19, 2011

Machine Design has recently featured an article introducing Air Squared's P6H8N3.0 miniature scroll compressor.

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Development for Fuel Cell Recirculation Pumps

August 12, 2011

High-reliability oxygen and hydrogen fuel cell recirculation pumps for a lighter-than-air aircraft application.

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100 lpm, 100 psi Scroll Compressor

September 04, 2011

Developed for use in testing pilot suits, the compressor will be ideal for dental applications.

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Miniature Compressor Development Complete

February 12, 2011

Air Squared has finished development on the first scroll-type, continuous-duty, high-efficiency miniature compressor.

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Semi-hermetic Scroll Compressor

June 04, 2006

New semi-hermetic scroll compressor and vacuum pump delivers 80% volumetric efficiency with smooth, quiet operation.

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Air Squared Helps Inogen Oxygen Concentrator

March 04, 2005

Rotary scroll compressor helps new Inogen One oxygen concentrator break sound, weight, and battery-life barriers.

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Introducing the World’s Smallest Scroll Compressor

November 01, 2003

Air Squared introduces the world's smallest scroll air compressor/pump for medical equipment, fuel cells, mass spectrometers.

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Tapping Scroll Technology for Pulse-free Air

January 01, 2002

New oil-free 0.5 hp compressor and vacuum pump taps clean, reliable scroll technology for pulse-free air in medical devices.

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Scroll Compressor Projects

Oil-Free Scroll Refrigeration Compressor for Aerospace

April 02, 2019

The P13H025A-BLDC-SH oil-free scroll refrigeration compressor is designed to support advanced environmental control systems in aerospace and military applications.

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Two-Stage Scroll Compressor for Vapor Compression Refrigeration

January 21, 2019

The semi-hermetic and two-stage P07T013A-BLDC-C-SH provides oil-free compression for organic vapor refrigeration and organic solvent extraction applications.

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High-Capacity Scroll Compressor for Fuel Cell Applications

November 09, 2016

Efficient and quiet, the P34H080A-BLDC scroll compressor is designed for oil-free air delivery in transportation fuel cell applications.

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Second Generation Semi-Hermetic Scroll Compressor

October 10, 2018

The second generation P22H038B-AC-SH semi-hermetic scroll compressor offers improved cooling, efficiency, and reliability for high-pressure and high-flow operation across a wide range of working fluids.

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Liquid-Cooled Scroll Compressor for Electric Bus

April 02, 2018

The P16H043A-AC-LC liquid-cooled scroll compressor is designed to quietly deliver high-pressure air for all-electric bus air-auxiliary systems.

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Quiet, High-Pressure Compressor for Commercial EV

April 28, 2018

The P16H030E-BLDC-LC liquid-cooled scroll compressor delivers high-pressure air at low noise levels for electric vehicle air-braking systems.

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Extremely Quiet Miniature Compressor for Medical Applications

March 30, 2018

The P05H012A-BLDC-C is poised to become the smallest and quietest production scroll compressor offered by Air Squared.

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Semi-Hermetic Scroll Compressor for CO2 Collection

March 08, 2018

The semi-hermetic P19H038A-BLDC-SH scroll compressor has no dynamic seals and is suitable for operation with CO2 and other gases.

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Durable and Compact Scroll Compressor for Commercial Aerospace

March 08, 2009

The P19H038A-BLDC is an oil-free, continuous duty scroll compressor designed for airborne needs, such as high-efficiency, lightweight, and reliability.

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Two-Stage Semi-Hermetic Compressor for Aerospace

July 28, 2016

The two-stage semi-hermetic P11T025B-BLDC-SH compressor combines high-performance, efficiency, and reliability, in a compact and lightweight design.

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Semi-Hermetic Scroll Compressor for Mars 2020 Mission

June 27, 2016

The semi-hermetic P11H024A-BLDC-SH compressor combines high-performance, efficiency, and reliability, in a compact and lightweight design.

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Liquid-Cooled Scroll Compressor with Integrated Motor for Fuel Cell Vehicles

January 22, 2016

The P32H076A-BLDC-LC liquid-cooled scroll compressor delivers high-flow efficient performance in an oil-free, reliable, and compact design - ideal for mobile fuel cell applications.

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Compact Oil-Free Scroll Compressor for Medical Devices

March 02, 2017

Intended as a lower-cost replacement for the popular P11H012A-BLDC-C scroll compressor, the near-silent P07H015A-BLDC-C is specifically designed for medical applications that require oil-free compressed air.

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Compact High-Pressure Scroll Compressor

January 15, 2015

The P09H015A-BLDC-SH semi-hermetic scroll compressor is capable of high-pressure, oil-free operation, in a compact and lightweight design.

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Semi-Hermetic Scroll Compressor with Integrated Water-Cooling

January 02, 2015

The semi-hermetic P32H080A-AC-SH-WC scroll compressor uses integrated water-cooling to compress helium without the need for lubrication.

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High-Pressure Scroll Natural Gas Booster

December 02, 2016

The P20H033A semi-hermetic scroll compressor has an inlet pressure rating over 100 bar, for oil-free operation with natural gas.

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Spinning Scroll Compressor for H2 Recirculation

April 03, 2014

The lightweight and semi-hermetic P21H050A-BLDC-SH-SS uses spinning scroll technology to recirculate high-temperature hydrogen in SOFCs.

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Small-Scale Scroll Cryogenic Pump

November 23, 2013

Compact, reliable, light-weight, and electrically-driven scroll, capable of pumping volatile liquids at extremely low temperatures.

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Miniature Medical Scroll Compressor

September 01, 2013

The compact, lightweight, and near-silent P08H014A-BLDC is designed for portable medical applications requiring oil-free compressed air.

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Lightweight, Compact, Oil-free Scroll Compressor

February 07, 2013

The oil-free P24H056A-BLDC scroll compressor delivers high-flow performance in a compact, lightweight design - ideal for mobile applications.

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Fuel Cell Hydrogen Recirculation Pump

November 01, 2011

P16H034C-BLDC-SH semi-hermetic scroll compressor for hydrogen recirculation in mobile fuel cell applications.

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P19H38N5.25 5 HP Scroll Compressor

March 01, 2010

Industrial scroll compressor designed for hybrid truck air brakes.

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Miniature Scroll Compressor for Circuit Cooling

April 12, 2009

The first scroll-type, continuous-duty, high-efficiency miniature compressor.

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High-Pressure Water-Cooled Compressor

September 01, 2007

Patented water-cooled scroll compressor for use in US Army vehicles.

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